TENS stands for transcutaneous electrical nerve stimulation.
Some hospitals have TENS machines available, otherwise you can hire your own. A TENS machine is usually most effective during the early stages of labour, and can help eliviate any lower back pain (which many women experience at this stage).
How it works
Electrodes are taped onto your back and connected by wires to a small battery-powered stimulator. Holding this, you give yourself small, safe amounts of current through the electrodes. You can move around while you use TENS.
A TENS machine works by stimulating the body to produce more of its own natural painkillers, endorphins, at the same time reducing the amount of pain signals sent to the brain by the spinal cord.
There are no known side effects for you or the baby.